From: ChenChen Zhou <357726167@qq.com>
Date: Sun, 27 Nov 2022 14:24:24 +0000 (+0800)
Subject: Fix preauth crash on memory exhaustion
X-Git-Tag: krb5-1.21-beta1~41
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7736144eb613f797dea57a44da33007a19602e5e;p=thirdparty%2Fkrb5.git

Fix preauth crash on memory exhaustion

In k5_preauth_request_context_init(), check the result of calloc().

[ghudson@mit.edu: rewrote commit message; added free() of reqctx on error]

ticket: 9079 (new)
---

diff --git a/src/lib/krb5/krb/preauth2.c b/src/lib/krb5/krb/preauth2.c
index ffca476c2b..32f35b7615 100644
--- a/src/lib/krb5/krb/preauth2.c
+++ b/src/lib/krb5/krb/preauth2.c
@@ -263,6 +263,10 @@ k5_preauth_request_context_init(krb5_context context,
      * preauth context's array of handles. */
     for (count = 0; pctx->handles[count] != NULL; count++);
     reqctx->modreqs = calloc(count, sizeof(*reqctx->modreqs));
+    if (reqctx->modreqs == NULL) {
+        free(reqctx);
+        return;
+    }
     for (i = 0; i < count; i++) {
         h = pctx->handles[i];
         if (h->vt.request_init != NULL)